Means for making tubular articles



May 12, 1925.

R. S. CURRIE MEANS FOR MAKING TUBULAR ARTICLES Filed April 19. 1924 m l 785 L` Inventor. @MM/f We lll Panarea May 12, 1925.

i'lEl) STATES l asians .PATENT ori-fics.

RICHARD s. cUaRIE, or moaonro, ONTARIO, CANADA.

MEANS Foa MAmNG TUBULAR ARTICLES.

Application led April 19, 1924. Serial N0. 707,765.v

To al?) whom t 'may concern.' A y Be it known that l, RICHARD S. CURRIE,

a subject of the King of Great Britain, andl resident of the city of Toronto, county of York, Province of Ontario, in the Dominion of Canada, have invented certain new and useful Improvements in Means for Making rlubular Articles, as described in the followingspecification and illustrated in thev accompanying drawings, that form part of the same.

The principal object of the invention is to reduce the cost of manufacture of bronze bushings by casting vthe metal in long lengths and a further object is to produce cast metal tubes of auniform thickness, vdiameter and texture which may be used for bushings or for other purposes.

The principal feature of the invention consists in the application of a longitudinal stress to the core around which the metal is poured, whereby the expansion of the corc is directed longitudinally and thereby re1 strained from lateral displacement.

The drawing is a sectional elevational view of a mould for carrying this invention into eect.

In the manufacture of bushings it has been the custom to cast the ,blanks in gated moulds and the blanks first have to be Ybroken from the gate and rough trimmed on an emery wheel to remove the gate lugor fins, after which it is chucked and bored and then placed on an arbor and finished externally.

This process is very costly and it is proposed by the present invention to produce bushings by casting a tubular length of metal of fair-ily accurate dimensions which may be handled in a turret lathe, the inside and outside shaping and finishing being accomplished before the bushing lengthv is cut off from the tube.

The principal diiiculty in connection with producing bushings in this manner is to` cast the metal in lengths sufficiently long to enable the minimum handling of the tube in a turret machine. n

The desired result has been achieved by applying a longitudinal stress `to the core while the metal is being poured.

ln the accompanying drawing is shown a c simple form of. mould illustrating the application of the invention.. The mould 1 is formed` in two halves, one. of which is rigidlysecured .to the base z and the other is mounted on a hinged support 3 on the base. The interior ofthe mould is made the desired shape of the exterior of the tube tobe cast, that is, it may be made cylindrical, hexagonal, or it may be made to form a casting with a .plurality of collars or fianges. k A

A plate Atis arranged to close the bottom of the mould and llas a central opening therein through which the core tube 5 is inserted. This core tube is provided with a fiange at the bottom end to engage the plate4.

The tube 5 is formed with a plurality of vent holes 7- and it is covered with a surface covering 8 of a suitable sand material which may be baked. or otherwise hardened thereon.

The upper end of the core tube 5 has a collar 9 secured thereto and this collar is shown supported' by a laterally extending arm 10 secured to a vertically slidable member l1 and this slidable member is engaged by a compression spring l2 which applies tension to the core tube, holding said tube centrally within the mould so that when the metalv is poured therein it will not float but will remain in its proper axial position.

The pouring of the metal into the mould createsa very intense beau-first at Athe lower end of the mould with the result that an ex` pansion takes place in the. core tube at its lower end. If this expansion is allowed to .take its normal course, the core tube will simply increase in diameter as the metal is poured into the mould but by reason of the application of a longitudinal stress upon the core tube the said tube instead of expanding laterally will expandl longitudi nally and the core will remain practically of a uniform diameter throughout its length.

The provision of a hollow core with vent holes -allows` the release of gases found in the pouring of the metal and a metal tube of an extraordinary uniform texture is produced.

What I claim as my invention is:'

1. A means for--moulding tubular articles Y comprising,v a vertically arranged mould formed in two longitudinal sections, one being rigid with thebase and the other hinged to swing outwardly, a perforated core tube secured at. the bottom end of said mould, and means carriedby the 'fixed portion of n p v 1,537,386

said mould and connected with the upper of the mould, a perforated corel tubev exend of said core tube for applying an elastending through said plate and flanged to tio tension thereto. engage the same, a sand covering on said 10 2. nA means for moulding tubular articles.4 lcore, and a spring connected to the top end comprising a mould split longitudinally and of said core tube and exerting a longitudihavin one-half thereof arran ed on a lnal tension thereon. y

hinge support,'a plate closing t e bottom RICHARD S. CURRIE. 

